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No spark?

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Since your getting no spark and no fuel injector pulse it sounds like it is a crankshaft sensor or camshaft sensor problem. It will have to be relearened at a dealership.
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Monday, October 5th, 2020 AT 10:09 AM (Merged)
Tiny
MLMDRYWALL
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 258,678 MILES
I'changed out the sensors, crank sensor, cam sensor, ignition control module, coil 2 times in 4 months
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Monday, October 5th, 2020 AT 10:10 AM (Merged)
Tiny
JNOVACK
  • MECHANIC
  • 723 POSTS
Sounds like you will have to have the PCM tested
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Monday, October 5th, 2020 AT 10:10 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I was just curious, did you do any testing before you replaced anything? Were there any codes?

Did you check for spark from the coil wire? The primary circuits to the coil, one is B+, the other ground pulse. Can you tell what is missing?
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Monday, October 5th, 2020 AT 10:10 AM (Merged)
Tiny
TERESA STAFFORD
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Replaced starter, cam shaft sensor, ECM, all fuses are good. Got 55 lbs at rail.
She sounds and acts like she wants to turn over but won't get the final push to actually start.
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Monday, October 5th, 2020 AT 10:10 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

What happens to the fuel pressure while cranking?

The spec is 55 to 62. you are at the low limit and these engines are very touchy with pressure. 5 lbs down and it will not run.

Does it have spark? does the tachometer move up a little on cranking?

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Roy
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Monday, October 5th, 2020 AT 10:10 AM (Merged)
Tiny
MPI12002
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  • 1 POST
Jeff, what exactly do the RPMs tell you when it's kicking over? Do the RPMs tell you if the crank shaft sensor is working or not?
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Sunday, January 16th, 2022 AT 5:35 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Hi,

If you don't have an RPM signal, chances are there is a problem with the crankshaft position sensor.

Let us know.

Joe
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Sunday, January 16th, 2022 AT 6:57 PM

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